KR20190037049A - Apparatus and Methods of RRC signaling to support Wide Bandwidth - Google Patents

Abstract

The present disclosure relates to a communication technique for fusing a 5G communication system with an IoT technology to support a higher data transmission rate than that of a 4G system, and a system thereof. The present disclosure can be applied to an intelligent service (for example, smart home, a smart building, a smart city, a smart car or connected car, healthcare, digital education, retail business, security- and safety-related services, etc.) based on a 5G communication system and an IoT-related technology. The present invention relates to a PHY/MAC layer operation of a terminal and a base station in a mobile communication system. A control signal management method in a wireless communication system comprises the steps of: receiving a first control signal transmitted from a base station; processing the received first control signal; and transmitting a second control signal generated based on the processing to the base station.

Description

[0001] The present invention relates to an RRC signaling method and apparatus for supporting 5G ultra-wideband,

The present invention relates to a PHY / MAC layer operation of a mobile station and a base station in a mobile communication system. More specifically, when a base station tries to transmit / receive an ultra-wideband signal with a single carrier, it can only transmit and receive signals in a limited band due to the operating band of the limited terminal and the power consumption of the terminal, And a method and apparatus for supporting efficient use and flexible and dynamic bandwidth changes.

Efforts are underway to develop an improved 5G or pre-5G communication system to meet the growing demand for wireless data traffic after commercialization of the 4G communication system. For this reason, a 5G communication system or a pre-5G communication system is called a system after a 4G network (Beyond 4G network) communication system or after a LTE system (Post LTE). To achieve a high data rate, 5G communication systems are being considered for implementation in very high frequency (mmWave) bands (e.g., 60 gigahertz (60GHz) bands). In order to mitigate the path loss of the radio wave in the very high frequency band and to increase the propagation distance of the radio wave, in the 5G communication system, beamforming, massive MIMO, full-dimension MIMO (FD-MIMO ), Array antennas, analog beam-forming, and large scale antenna technologies are being discussed. In order to improve the network of the system, the 5G communication system has developed an advanced small cell, an advanced small cell, a cloud radio access network (cloud RAN), an ultra-dense network, (D2D), a wireless backhaul, a moving network, cooperative communication, Coordinated Multi-Points (CoMP), and interference cancellation Have been developed. In addition, in the 5G system, the Advanced Coding Modulation (ACM) scheme, Hybrid FSK and QAM Modulation (FQAM) and Sliding Window Superposition Coding (SWSC), the advanced connection technology, Filter Bank Multi Carrier (FBMC) (non-orthogonal multiple access), and SCMA (sparse code multiple access).

On the other hand, the Internet is evolving into an Internet of Things (IoT) network in which information is exchanged between distributed components such as objects in a human-centered connection network where humans generate and consume information. IoE (Internet of Everything) technology, which combines IoT technology with big data processing technology through connection with cloud servers, is also emerging. In order to implement IoT, technology elements such as sensing technology, wired / wireless communication, network infrastructure, service interface technology and security technology are required. In recent years, sensor network, machine to machine , M2M), and MTC (Machine Type Communication). In the IoT environment, an intelligent IT (Internet Technology) service can be provided that collects and analyzes data generated from connected objects to create new value in human life. IoT is a field of smart home, smart building, smart city, smart car or connected car, smart grid, health care, smart home appliance, and advanced medical service through fusion of existing information technology . ≪ / RTI >

Accordingly, various attempts have been made to apply the 5G communication system to the IoT network. For example, technologies such as a sensor network, a machine to machine (M2M), and a machine type communication (MTC) are implemented by techniques such as beamforming, MIMO, and array antennas It is. The application of the cloud RAN as the big data processing technology described above is an example of the convergence of 5G technology and IoT technology.

In a conventional LTE system, a multi-carrier scheme is employed in which a plurality of component carriers (CC) are bundled and operated such as Carrier Aggregation (CA) and Dual Connectivity (DC) in order to support a wide bandwidth. Aggregation of up to 32 CCs can support a bandwidth of 640 MHz based on 20 MHz CC. However, if a scheme such as LTE CA is applied to support ultra-wideband (1 GHz) in a 5G NR (New Radio) system, the number of combinations of CCs to be used by the UE increases exponentially and the size of the capability report of the UE increases And can only operate within a limited CC combination. Also, as the number of CCs increases in the CA, the reception complexity of the terminal and the control complexity of the base station are also increased. However, despite this problem of CA / DC, it shows more flexibility in resource usage than single carrier. This is because the extension band can be changed by SCell Addition / Release and the cross-carrier scheduling can schedule transmission / reception of resources to another CC.

The present invention proposes a limited base station signal reception procedure considering the power consumption of a terminal in a single carrier and a control method using the entire system band flexibly and flexibly.

According to an aspect of the present invention, there is provided a method of processing a control signal in a wireless communication system, the method comprising: receiving a first control signal transmitted from a base station; Processing the received first control signal; And transmitting the second control signal generated based on the process to the base station.

According to an embodiment of the present invention, a plurality of terminals having various sizes of bands can be controlled to use resources evenly in the operating band of the system. In addition, scheduling, modulation and coding scheme (MCS), channel state indication (CSI) reporting, measurement, and the like are performed within the set partial band of the UE, and the reduction of scheduling and handover performance for the entire bandwidth is minimized . Also, if a connection problem occurs in a partial band set by the terminal, it can be recovered within a short delay.

Figure 1 shows an LTE Scalable BW system.
2 shows various band division schemes.
3 shows a band structure proposed by the invention.
Figure 4 shows the SCell addition procedure of LTE.
5 shows an example SCI / BWP addition procedure of-5G NR.
Figure 6 shows an example of the SCell / BWP addition procedure of 5G NR-II.
Figure 7 shows an exemplary SCell / BWP addition procedure of-5G NR-III.
Figure 8 shows an exemplary SCell / BWP addition procedure of-5G NR-IV.
Figure 9 shows an example of a BWP addition procedure of 5G NR.
10A shows an example -I of Single Active BWP.
Figure 10B shows an example-II of Single Active BWP.
11A shows an example -I switching between multiple active BWPs.
FIG. 11B shows an example-II switching between multiple active BWPs.
12A shows an example-I of activation / deactivation between Multiple Active BWPs.
12B shows an example-II for activation / deactivation between Multiple Active BWPs.
Figure 12C shows an example-III of activation / deactivation between Multiple Active BWPs.
12D shows an example-IV of activation / deactivation between Multiple Active BWPs.
FIG. 13 shows an example of group switching between Multiple Active BWPs.
14A schematically shows an operation of performing self-BWP scheduling and cross-BWP scheduling of downlink data transmission / reception.
14B shows three types of band scheduling schemes in more detail in the case of downlink.
Figure 15 shows the operation of a flexible BW system.
16 shows a configuration diagram of a terminal device according to the embodiment of the present disclosure.

The present invention proposes a control and setting method for UWB transmission / reception in a 5G mobile communication system. In particular, we consider a method for scheduling, handover, and RLF (Radio Link Failure) recovery in ultra-wideband. In the 5G mobile communication system, various services (or slices) such as enhanced Mobile BroadBWP (eMBB), Ultra Reliable and Low Latency Communication (URLLC) and enhanced Machine Type Communication (eMTC) are expected to be supported. This can be understood in the same context as that the Voice over Internet Protocol (VoIP) and BE (Best Effort) services are supported in LTE, which is a 4G mobile communication system. In addition, various numerology is expected to be supported in 5G mobile communication system. This means specifically subcarrier spacing, which directly affects the Transmission Time Interval (TTI). Therefore, it is expected that TTI of various lengths will be supported in the 5G mobile communication system. This is one of the characteristics of the 5G mobile communication system, which is very different from that of the standardized LTE so far, in which only one kind of TTI (1 ms) is supported. If the 5G mobile communication system supports a TTI (for example, 0.1 ms) which is much shorter than the 1 ms TTI of LTE, it is expected to be a great help in supporting URLLC which requires a short delay time. In this document, numerology is used to describe subcarrier spacing, subframe length, symbol / sequence length, and so on. Also, numerology can cause the terminal to have different BWs. The base station may be represented by various abbreviations such as gNB, eNB, NB, and BS. The UE can be represented for various abbreviations such as UE, MS, STA, and the like.

LTE introduced Scalable BW concept to support various BW. According to Figure 1, an LTE system supports terminals with various BW (e.g., 5/10/20 MHz) with the same center frequency. For example, in the case of a UE supporting 5 MHz for UE1 and 10 MHz for UE2, the LTE base station appropriately configures a control channel and transmits a control signal so that UE1 and UE2 can receive it. However, this method is extremely limited when the entire available bandwidth of the base station is very large, that is, when the bandwidth is ultra-wide, the resources available for a relatively small band terminal are extremely limited. In case of UE3, if it operates at the edge of the base station using band, the control signal of the base station can not be distinguished and received.

Therefore, in the 5G NR communication system, the terminal must be able to transmit and receive important control signals in order to maintain the connection with the base station even in a band not supported by the existing Scalable BW system. Significant control signals are transmitted via PCell to the Signaling Radio Bearer (SRB) in case of LTE. In addition, PCell transmits and receives control signals for scheduling and HARQ procedures in PCell itself and SCell. LTE's PCell or SCell can all be viewed as one independent cell. For each cell, a separate MAC entity and corresponding link adaptation and HARQ entity are required. However, in the 5G NR Single Carrier communication system, the whole band actually corresponds to one cell. Also, the functions of PCell for connection / connection setup / maintenance and data transmission / reception of the terminal should be basically provided.

However, even if the base station operates in the ultra-wideband, the terminal can transmit / receive only the partial bands at once because of limited implementation and complexity. In order to operate in a band larger than the maximum usable bandwidth (Capable BW) of the terminal, it is necessary to divide and operate in time. The base station can divide the UWB into a suitable band part or bandwidth part (BWP) for management, and instruct the UE to perform various MAC functions (scheduling, measurement, link adaptation, MCS, HARQ) . Also, the terminal can determine and receive the structure of the control channel and the reference signal based on the band part. According to FIG. 2, in Case A, UE 1 can operate with only a part of the available band, but not all of the available band due to the fixed size band setting of the base station. In Case 2 (UE2) of Case B, the maximum available bandwidth is smaller than the bandwidth of the band 4 set by the base station, so that it is impossible to support it. Therefore, if the unit of the band part is minimized like the case C, the band to be used by the terminal can be represented by a bundle of such a small unit. On the other hand, a too large number of band parts may cause a load increase in management, so a method of setting the size freely is useful as in case D.

According to the present invention, in order to solve the problem of the method in which the base station divides an entire band into a band part up to the case AD and sets the band part to the UE, a band part having a different size is set for each UE. In the system, a PHB resource block (PRB) A band part set by the terminal can be expressed by a combination of the band part and the band part. In addition, we perform scheduling, link adaptation, MCS, and HARQ procedures in the band part set up in the terminal without performing independent scheduling, link adaptation, MCS, and HARQ procedures in the band part divided in the system view.

The structure of the physical layer control channel means that a single band unit can support a terminal having a band that can be represented by a multiple of the PRB, as shown in FIG. However, a terminal having a band larger than the set band portion need not be supported by the band portion. The size of the band part, which is a bundle of PRBs, is determined by at least one of channel characteristics, numerology, control channel size, and minimum packet size between the UE and the BS. The UE performs one MAC function set (scheduling, MCS, HARQ, etc.) for one service.

[BWP setting method]

The base station sets the physical layer resource block, that is, the configuration of the PRB (PHY Resource Block), to the mobile station in one of a system information (SI) or an RRC connection establishment procedure. The PRB setting can be expressed as a number of REs (resource units, i.e., one resource unit consisting of subcarrier spacing and symbols) and REs in the time and frequency domain. The time domain can be represented by a symbol number and the frequency domain can be expressed by a subcarrier spacing number. The RE may vary according to the type of Numerology. If the BS divides the resource into a plurality of different Numerology regions, the subcarrier spacing and the symbol length constituting the RE in each region may be different. Therefore, when a plurality of Numerology areas are supported, a plurality of RE formats must be set for the UE. On the other hand, one PRB can be represented by k REs. The value k can be set to (one of) a value irrespective of the Numerology area or, if necessary, the value of the Numerology area can be set to the terminal by an additional SI or RRC message. For a terminal to which PRB information is set, the base station can set the operating band of the terminal to IDLE or CONNECTED mode terminal in units of PRB. That is, one continuous frequency region is indicated by the PRB index and the number, and a so-called band portion (BWP portion) is set. The band part can be called BWP, BWPwidth part, BW part, BW unit and so on. At this time, the sizes of the PRBs are the same, but the sizes of the band parts may be different according to the setting. The band part setting may be set to the terminal by the SI or RRC message together with the PRB setting, or may be set to the terminal by the SI or RRC message separately from the PRB setting. Therefore, according to the embodiment, it is possible to set the PRB to SI and the band part to set the RRC message. On the other hand, since the band part is expressed as a basic unit of the PRB, the network must inform the UE of the numerology information to set the band part by SI or RRC message. The terminal can accurately grasp the structure of one band part by integrating the numerology information set for each band part and the PRB information for each numerology. If only one of the band part or the PRB is set, the terminal can obtain the information from the set band part or the PRB information according to a predetermined rule in order to obtain the remaining one piece of information.

On the other hand, each PRB is a unit which is divided in terms of the network, but the band part can be set for each terminal and the area can overlap in terms of the network. In addition to the set band, the location and number of control resource sets can be set. A control resource set can be called a control sub-band, a control sub-resource, a control channel resource, or the like. The control resource set represents a set of resources receiving DCI (Downlink Control Information) from the control channel observed by the UE. At least one control resource set for each terminal can be set for one band part. In addition, a common control resource set can be set for a specific band part. A DL assignment or UL grant message for general UE-specific scheduling indicates a control resource set for each UE. If the UE does not refer to another band unit, The UL grant message is accepted as a data transmission / reception instruction for the same band part. That is, there is a one-to-one relationship between control resource sets and band parts for each terminal. In this case, the start (or end) point of the first RB should match the start (or end) point of the band part or be a position that can be directly calculated from the band part and the PRB setting information. The base station can notify the resources allocated to the start point and the number of RBs in case of an instruction to the same band part, and in case of an instruction to another band part, index information indicating the band part in addition to the PRB information must be informed. The terminal grasps the position of the band part in terms of the PRB division standard from the network point of view and grasps the PRB division standard calculated in accordance with the numerology information per band part in one band part. Therefore, the BS must include index information for each band to set one or more band portions to the UE. On the other hand, the band part can be divided into a DL band part, an UL band part, or an SL (Sidelink) band part according to a transmission direction.

The UE can set the band through an RRC Connection Establishment procedure or an RRC Connection Reconfiguration procedure for switching from Idle mode to Connected mode.

The base station sets up a control resource set connected to at least one pair of DL / UL band units or DL / UL band units through RAR (Random Access Response) or Msg4 (eg RRC Connection Setup Complete) in the RRC connection establishment procedure, After the procedure is completed and the SRB1 (Signaling Radio Bearer 1) is set up, a set of control resources connected to one or more band units or band units can be set while setting the SRB2 and DRB (Data Radio Bearer) through the RRC Connection Reconfiguration procedure. If at least one of the DL band part and the UL band part used by the UE in the Connected mode can be set by at least one of the following methods, if the setting for the separate band part is not in the RRC Connection Establishment procedure or the RRC Connection Reconfiguration procedure.

Method 1. Set the DL band part in the same way as the band part for receiving the system information

Method 2. Set the DL band part as same as the band part for receiving RAR

Method 3. Set the DL band part in the same way as the band part for receiving Msg4

Method 4. Set the UL band part in the same way as the band part for transmitting Msg3

Method 5. Set the DL band part with BCH (Broadcast Channel)

Method 5. Set the UL band part with BCH

Method 6. According to a predetermined rule, a band part and a control resource set used in the connected mode can be set based on at least one of the SS band, the SI reception band part, the RAR reception band part, the Msg3 transmission band part, and the Msg4 reception band part.

For the setting of the band part, it is necessary for the network to acquire information related to the setting and retuning of the RF information and the band related to the band part of the terminal. In the Initial Attach procedure, a network or a base station can transmit a UECapabilityEnquiry message to the UE to request capability information of the UE. In accordance with the UECapabilityEnquery of the base station, the UE shall report UECapabilityInformation including the band related information to the base station. The terminal shall transmit the capability information of the terminal to the network during the procedure of connecting to the network (i.e., Random Access or RRC (re) configuration). The capability information includes at least one of the following information: the number of RFs, the maximum operating band of one RF, the maximum operating band of the terminal, the RF retuning delay time of the terminal where the center frequency is maintained, RF retuning delay time, operable Numerology type. The base station sends this information to the MME for storage. After the Initial Attach, the BS can derive the Capability information of the UE and the Band related information from the MME based on the ID of the UE.

The functions that can be provided by the system structure proposed by the present invention can be considered as follows.

Configuration of control / RS / CSI report / HARQ feedback per BWP

Self- / cross-BWP scheduling

RRM 측정

The base station can inform the terminal of the range (start, size or center frequency and bandwidth) of the band part by expressing it as a multiple of PRB, which is the basic unit, when setting the band part. Since the position and the range of the band part are a part of one carrier in which the network system operates, the frequency offset for the center frequency of the entire carrier band and the bandwidth of the band part can be set. Or the frequency offset of the center frequency at which the synchronization signal detected by the terminal is located and the bandwidth of the band part. Meanwhile, the center frequency of the carrier band understood by the UE is always the center frequency of the synchronization signal detected by the UE or the center frequency information of the carrier indicated by SI (System Information) connected to the synchronization signal detected by the UE , Or the center frequency information of the carrier indicated by the base station in the RRC Connection Establishment procedure or the RRC Connection Reconfiguration procedure. The terminal understands the band range as a band that can be seen at a time. Therefore, it should be designed so that the signal transmission / reception between the base station and the terminal can be performed regardless of a certain band band. For example, the position of the reference signal RS or the control channel transmitted by the base station should be able to transmit / receive based on the range of the DL band set by the UE. Also, the CSI report transmitted by the UE or the location of the HARQ feedback should be transmitted / received based on the range of the UL band set by the UE.

Meanwhile, the procedure for setting a band part for PCell or SCell may be different. Describe the case of PCell below. PCell inherits one DL BWP and one UL BWP from the initial DL / UL BWP in the initial connection process. However, if additional BWP is required, the base station performs one of the following procedures.

1) If the terminal receives the RRCConnectionSetup message or the RRCConnectionReconfiguration message from the base station and drb-ToAddModList is included in the message, sets the radio resource according to radioResourceConfigDedicated indicating drb-ToAddModList, and regards this base station as PCell.

2) or if the terminal receives the RRCConnectionSetup message or the RRCConnectionReconfiguration message from the base station and the bwp-ToAddModList is included in this message, sets the radio resource according to the radioResourceConfigDedicated indicated by bwp-ToAddModList, and regards this base station as the PCell.

Describe the case of SCelll below. SCellToAddModList can be replaced with SCellToAddModListSCG or PSCellToAddModList.

1) If the terminal receives the RRCConnectionReconfiguration message from the base station and the SCellToAddModList is included in the message, it sets the system information and radio resources according to the radioResourceConfigCommonSCell and radioResourceConfigDedicatedSCell indicated by SCellToAddModList, and regards this base station as SCell. The resource pointed to by SCellToAddModList is the default BWP for this SCell.

2) Or, if the terminal receives an RRCConnectionReconfiguration message from the base station and SCellToAddModList is included in the message, then if the SCellToAddModList includes bwpToAddModList, system information and radio resources are set according to radioResourceConfigCommonSCell and radioResourceConfigDedicatedSCell indicated by bwpToAddModList, This base station is regarded as SCell.

3) Or, if the terminal receives the RRCConnectionReconfiguration message from the base station and SCellToAddModList and bwpToAddModList are included in the message, then system information and radio resources are set according to the radioResourceConfigCommonSCell and radioResourceConfigDedicatedSCell which are commonly indicated by the connection relationship between SCellToAddModList and bwpToAddModList , And this base station is regarded as SCell.

The base station designates one or more band portions to be set in the PCell as radioResourceConfigDedicated. Or the base station indicates one or more band portions to be set in the SCell to radioResourceConfigDedicatedSCell.

When the band part is set in the terminal, the information can be stored in a table structure as shown below.

The BWPIndex can be sorted by cell or by one MAC entity. CellIndex is not required when it is assigned by cell. If it is classified by one MAC entity, it should include information on which cell the BWP belongs to. It may also include information that tells which BWP is primary BWP, or that BWPIndex 0 is always the primary DL BWP or primary UL BWP. Alternatively, some BWPs can be paralled with other BWPs for power control as shown in Table 5. This is necessary in order to preset the BWP to be moved by a condition such as timer expiration in one BWP. Alternatively, as shown in Table 6, it is possible to set the BWP to be activated immediately. Or whether or not the sync signal exists as shown in Table 7. [ The following table structures are shown in various cases. In the table, PRB offset represents the interval from PRB 0.

In the present invention, the primary BWP is used as an initial active BWP that is initially activated and used when a terminal is initially connected to a base station and a connection is established, or as a Default BWP that falls back on a control signal loss of BWP switching. If necessary for explanations in the text, use explicitly as initial active BWP or Default BWP.

BWPIndex 数ology PRB offset Number of PRBs Control resource set information CellIndex 0 Num # 0 50 6 CORESET # 0 0 One Num # 1 0 50 CORESET # 1 0 2 Num # 2 56 50 CORESET # 2 0 3 Num # 1 0 100 CORESET # 3 One

DL BWP table

BWPIndex 数ology PRB offset Number of PRBs Control resource set information CellIndex 0 Num # 0 0 20 CORESET # 0 0 One Num # 1 20 20 CORESET # 1 0

UL BWP table

BWPIndex 数ology PRB offset Number of PRBs Control resource set information CellIndex DL / UL 0 Num # 0 50 6 CORESET # 0 0 DL One Num # 1 0 50 CORESET # 1 0 DL 2 Num # 2 56 50 CORESET # 2 0 DL 3 Num # 1 0 20 CORESET # 1 0 UL

DL / UL BWP table I

BWPIndex 数ology PRB offset Number of PRBs Control resource set information CellIndex DL / UL Primary 0 Num # 0 50 6 CORESET # 0 0 DL On One Num # 1 0 50 CORESET # 1 0 DL 2 Num # 2 56 50 CORESET # 2 0 DL 3 Num # 1 0 20 CORESET # 1 0 UL On

DL / UL BWP table II

BWPIndex 数ology PRB offset Number of PRBs Control resource set information CellIndex DL / UL Pair 0 Num # 0 50 6 CORESET # 0 0 DL - One Num # 1 0 50 CORESET # 1 0 DL BWP # 0 2 Num # 2 56 50 CORESET # 2 0 DL BWP # 2 3 Num # 1 60 20 CORESET # 1 0 DL

DL / UL BWP table III

BWPIndex 数ology PRB offset Number of PRBs Control resource set information CellIndex DL / UL Initial active BWP 0 Num # 0 50 6 CORESET # 0 0 DL Yes One Num # 1 0 50 CORESET # 1 0 DL 2 Num # 2 56 50 CORESET # 2 0 DL 3 Num # 1 0 20 CORESET # 1 0 UL Yes

DL / UL BWP table IV

BWPIndex 数ology PRB offset Number of PRBs Control resource set information CellIndex DL / UL Synchronous signal 0 Num # 0 50 6 CORESET # 0 0 DL Yes One Num # 1 0 50 CORESET # 1 0 DL 2 Num # 2 56 50 CORESET # 2 0 DL 3 Num # 1 0 20 CORESET # 1 0 UL

DL / UL BWP table IV

The terminal receives the BWP setting from the base station to configure the table. The BWP configuration of the base station must include at least one of the following information:

- BWPIndex, Numerology, PRB offset (ie BWP location), Number of PRBs (ie BW of BWP), CORESET settings, Communication direction (DL, UL, SUL, Sidelink), CellIndex, CarrierIndex, Center frequency, active BWPIndex (DL, UL, SUL), primary BWP (DL), default BWP (DL)

The paring setting of the information may be explicitly indicated, but implicitly indicated by other information. For example, BWPIndex, or PRB offset, or CellIndex or CarrierIndex, or center frequency, or at least one of the TDD settings may be the same. , The center frequency can be calculated from PRB offset and Number of PRBs.

The base station can set one or more BWPs in a bundle according to the communication direction among the information. The same information can be set for this bundle, for example, the initial Active BWP or Default BWP can be explicitly set to BWPIndex or fixed to BWPIndex in the specification.

[Activation / deactivation]

Immediately after the RRC Connection Establishment procedure is completed or the RRC Connection Reconfiguration procedure is completed, at least one of the DL band portions set in the PCell must be active and at least one of the UL band portions set in the PCell must be active. On the other hand, the DL or UL band part set in the SCell is in the Deactivated state.

Therefore, the UE sets up a band from the RRC Connection Establishment for the PCell or the RRC Connection Reconfiguration to the radioResourceConfigDedicated, and sets the basic Active DL band part and the basic Active UL band part separately. Meanwhile, the UE sets the basic band part separately by setting the radioResourceConfigCommonSCell or radioResourceConfigDedicatedSCell through the RRC Connection Reconfiguration procedure for the SCell. Once the RRC Connection Reconfiguration procedure is completed, deactivate all the configured band parts once.

If you set the band with radioResourceConfigCommonSCell:

- A default active DL band portion is additionally set in addition to the existing DL setting (DL BWPwidth, Antenna info common, MBSFN subframe configuration list, PHICH configuration, PDSCH common configuration, and TDD configuration).

- In addition to the existing UL setting (UL carrier frequency, UL BWPwidth, p-Max, Uplink power control common SCELL, Common information of physical channels, SRS UL common information, UL CP length, PRACH configuration, And further sets the UL band portion.

If you set the band with radioResourceConfigDedicatedSCell:

- A default active DL band unit is additionally set in addition to the existing DL setting (Information related to Transmission Mode for the SCell, Cross Carrier Scheduling configuration, SCell CSI reference signal information, and SCell PDSCH dedicated configuration)

- A default active UL band unit is additionally set in addition to the existing UL setting (Uplink Transmission Mode for SCell, Uplink dedicated Power Control information, CQI Reporting configuration for SCell, SCell's dedicated SRS configuration).

If the RRCConnectionReconfiguration message received from the base station includes mobilityControlInfo, the mobile station can monitor the band part of the target base station indicated by mobilityControlInfo.

A. Option 1:

1> if the carrierFreq is included:

2> if the BWP of the carrierFreq is included

   3> consider the target PCs to be one on the BWP of the frequency indicated by the carrierFreq with a physical cell identity indicated by the targetPhysCellId;

1> else:

2> if the BWP is included

Consider the target PCoL to be one on the BWP of the frequency of the source PCell with a physical cell identity indicated by the targetPhysCellId;

B. Option 2

1> if the BWP is included:

2> if the carrierFreq is included:

   3> consider the target PCs to be one on the BWP of the frequency indicated by the carrierFreq with a physical cell identity indicated by the targetPhysCellId;

1> else:

2> if the carrierFreq is included:

   3> consider the target PCell to a frequency of the source PCell with a physical cell identity indicated by the targetPhysCellId;

The UE can determine whether the DL / UL BWP used in the serving cell at the time of HO can be used equally in the target cell according to the RRC control signal of the base station. the serving cell can inform the UE of an indication that the DL / UL BWP configuration information identical to the current serving cell can be reused, instead of giving the UE the DL / UL BWP configuration information of the target cell. Upon receiving the BWP configuration reuse indicator, the UE maintains the DL / UL BWP settings set in the serving cell.

According to an exemplary embodiment, the BS can notify the UE of an indication that the initial active DL / UL BWP configuration information identical to the current serving cell can be reused, instead of providing the DL / UL BWP configuration information of the target cell. Upon receiving the BWP configuration reuse indicator, the UE maintains the initial active DL / UL BWP configuration in the serving cell and releases the remaining active BWP configurations other than the initial active DL / UL BWP set in the serving cell.

According to another embodiment, the base station can notify the UE of an indication that it is possible to reuse the same default DL / UL BWP configuration information as the current serving cell, instead of giving DL / UL BWP configuration information of the target cell. When the UE receives the BWP configuration reuse indicator, it retains the default DL / UL BWP settings in the serving cell and releases the remaining BWP settings other than the default DL / UL BWP set in the serving cell. When the mobile station completes the HO with the target cell, it acquires the initial active DL / UL BWP information of the target cell from the target cell system information and updates the DL / UL BWP configuration.

The UE can determine whether the DL / UL BWP used in the serving cell at the time of HO can be reused in the target cell according to the RRC control signal of the base station. If the serving cell does not give the DL / UL BWP configuration information of the target cell to the UE in the HO command, it determines that the same DL / UL BWP configuration information as the current serving cell is reusable and maintains the DL / UL BWP settings set in the serving cell do.

According to one embodiment, the UE can determine whether a portion of the DL / UL BWP used in the serving cell at the time of HO can be reused in the target cell according to the RRC control signal of the base station. If the serving cell gives only the UL BWP setting of the target cell to the UE in the HO command, it determines that the same DL BWP setting information as the current serving cell is reusable and maintains the DL BWP setting set in the serving cell.

The terminal can determine the BWP that can be used in the target cell at the time of HO according to the RRC control signal of the base station. When the serving cell gives the DL / UL BWP setting information of the target cell to the UE in the HO command, it operates according to the DL / UL BWP setting of the target cell for transmitting / receiving the target cell.

According to one embodiment, the UE can determine the BWP that can be used in the target cell at the time of HO according to the RRC control signal of the base station and the System Information (SI) of the target cell. If the Serving cell gives the UL BWP configuration information of the target cell to the UE in the HO command, it operates according to the UL BWP setting of the target cell for the transmission and reception operation to the target cell. The terminal receives the SI of the target cell for setting the DL BWP, acquires the DL BWP setting, and performs transmission and reception operations together with the UL BWP setting. When there are a plurality of DL BWPs to be acquired by the SI, the UE can operate by selecting DL BWPs in which at least one of the first BWP, BWPIndex, and BWP location information matches.

If the RRCConnectionReconfiguration message received from the base station includes sCellToAddModList, the UE performs SCell addition or modification. Figure 1 shows a signaling procedure for general SCell addition.

Figure 4 shows the SCell addition procedure of the existing LTE. RRC Connection Establishment procedure is performed through Msg1 (RAP), Msg2 (RAR) of Random Access procedure, and RRC Connection Request and RRC Connection Setup, which are RRC messages. Subsequently, the base station transmits an RRC Connection Reconfiguration message including the SCellToAddModList for SCell addition to the UE. The terminal can not activate the SCell until it receives an activation instruction from the MAC CE for the set SCell.

In FIG. 5, the base station transmits RRC Connection Reconfiguration once more including BWPToAddModList in order to add a band portion, compared to the existing SCell addition procedure. The additional set band part can be designated as MAC CE like SCell or DCI.

In FIG. 6, when transmitting the RRC Connection Reconfiguration, SCellToAddModList and BWPToAddModList for SCell are transmitted in comparison with the existing SCell addition procedure. The additional set band part can be designated as MAC CE like SCell or DCI.

In FIG. 7, when transmitting the RRC Connection Reconfiguration, SCellToAddModList and BWPToAddModList for SCell are transmitted in comparison with the existing SCell addition procedure. Activation is instructed to the SCell with MAC CE without additional activation instruction for the additional set band part, and the band part linked to the SCell is activated. Interworking information can be included in BWPToAddModList in RRC Connection Reconfiguration.

In FIG. 8, when transmitting an RRC Connection Reconfiguration, SCellToAddModList and BWPToAddModList for SCell are transmitted in comparison with the existing SCell addition procedure. When the Activation is instructed for the additional band part, the SCell linked to the band part is activated without MAC CE for separate activation for SCell. Interworking information can be included in BWPToAddModList in RRC Connection Reconfiguration.

FIG. 9 shows a network reset procedure for the band portion. That is, the UE receives the RRC Connection Reconfiguration message of the base station and adds a new band part or updates information of an existing band part. At this time, addition and update to the band portion are possible irrespective of whether the corresponding BWP is set in PCell or SCell.

If the modification of the SCell is instructed by the RRCConnectionReconfiguration message of the base station, the UE changes from one SCell to another SCell. If the previous SCell is deactivated, this SCell can be deactivated. Or, if the previous SCell is activated and at least one band is activated, activate one band part set for this SCell.

<RRC Connected Inactive-Resume>

The terminal maintains the RRC connection with the base station in the RRC Connected state, and can be switched to the RRC Inactive state under certain conditions. Then, the UE can request the RRC Connection Resume Request to the base station to switch from the RRC Inactive state to the RRC Connected state. The base station transmits the RRC Connection Resume to the UE and completes this procedure.

Meanwhile, the terminal can operate by activating the band part for the URLLC, and can be switched to the RRC Inactive state according to the condition. When the terminal requests the RRC Connection Resume Request to the base station, it may add at least one of the following information.

- Previous Active Band Index

- Previously set primary band index

- DRB Index linked to the previously used Active band

- Previously set Initial active Band Index

- Previous Default Bands Index

In accordance with the RRC Connection Resume Request of the UE, the BS can add at least one of the following information to the RRC Connection Resume message or the MAC CE.

- Band to use when Resume Index

- Previously set primary band index

- DRX Index to be linked with the band part to be used for resume

- Previously set Initial active Band Index

- Previous Default Bands Index

The MS proceeds with the RRC Connection Reestablishment procedure after declaring the RLF. If the RRC Connection Reestablishment is successful, the terminal shall be reset to use the band part according to one of the following methods.

Method 1: RLF Recovers all previously set band parts.

Method 2: Recover the default band part set before RLF.

Method 3: Restore the last active band in the band before RLF.

Method 4: Recover the initial active band set before RLF.

BWP (p-BWP main band part) is called a band part which is monitored by the terminal in order to monitor it basically, and it is not performed until a separate control / setting is performed in p-BWP in a resource area other than p-BWP have. The s-BWP selectively operates according to the setting through the p-BWP, and the p-BWP and the s-BWP may be called the first RF BWP and the second RF BWP according to the embodiment. Also, the p-BWP may be activated in at least one of the set band candidate candidates through the RRC message or the MAC CE. In addition, the s-BWP may be activated in an RRC message or an active state through MAC CE or DCI among at least one set band part. In a similar manner, the base station may instruct a terminal to transmit a deactivation signal / message via an RRC message or a MAC CE or DCI to deactivate one or more band portions from the activated state to the deactivated state.

When setting p-BWP, both DL BWP and UL BWP must be set. The connection information between DL BWP and UL BWP is set as needed. For TDD, the frequency positions of DL BWP and UL BWP may be the same. The P-BWP configuration includes at least one DL BWP and one or more UL BWPs, and the base station can set up the terminal through the RRC Connection Establishment or RRC Connection Reconfiguration procedure as described above. When the UE reports the UE capability report including the RF information to the base station, the base station can set the p-BWP in at least one of the different RFs of the UE.

The DL BWP of the P-BWP is set considering at least one of the following operations.

a) The terminal shall receive Common Signaling. For this purpose, the control resource set including the Common Search Space should be set.

b) A control resource set including a search space for a terminal group can be set.

c) In cross-BWP scheduling, it is set to DL BWP that the UE monitors.

d) Set to DL BWP to specify for RRM measurement.

e) Set the DL BWP to be monitored by the UE according to the fallback operation.

The UL BWP of the P-BWP is set considering at least one of the following operations.

a) And sets the PUCCH in this UL BWP.

b) The UE sets the SR (Scheduling Request) to the BWP to be sent first.

c) The terminal sets at least one BWP to which the SRS (Sounding RS) is transmitted.

d) And sets the BWP to send HARQ ACK / NACK of the UE according to the fallback operation.

e) Set to UL BWP to use when no separate BWPindex is specified in the UL grant.

f) Set PRACH resources for contention-based random access.

The difference between the setting and operation of p-BWP and active BWP is explained in more detail. The base station may further set one or more BWP settings together with p-BWP in the RRC to the UE. For the BWP set to P-BWP, the terminal can be configured to receive at least one of the following: 1) RRC message, 2) MAC CE, 3) L2 common signaling, 4) L1 common signaling, have. Also, it is assumed that at least one of the other functions, that is, 1) RLM (Radio Link Monitoring), 2) Idle mode DRX, 3) Connected mode DRX, 4) measurement, 5) -BWP. &Lt; / RTI &gt; However, the RLM, measurement, and connected mode DRX functions can be set by the base station to operate in s-BWP as well as p-BWP. If BWP # 0 is instructed to BWP switch or cross-BWP scheduling for another s-BWP (BWP # 1), p-BWP (BWP # - Deactivate BWP (BWP # 0) for a while and activate another s-BWP (BWP # 1). At this time, the operation of the terminal is restricted in the switched s-BWP (BWP # 1) according to the above-described message-specific or function-specific setting. In this respect, both p-BWP and s-BWP can be active BWPs, but the behavior of the terminal according to BWP may be different. For example, when the RLM and RLF (Radio Link Failure) functions are applied only to the p-BWP, the terminal operation is different when applied to both the p-BWP and the s-BWP. When the RLM / RLF is applied only to the p-BWP, the UE does not trigger the RLF event even if the UE does not perform the RLM operation or does the RLM operation when the s-BWP is activated. In this case, the procedure to fall back from the s-BWP to the p-BWP can be replaced, which will be described below. If RLM / RLF is applied to both p-BWP and s-BWP, the terminal can trigger RLM and RLF events for the activated BWP among all BWPs for which RLM / RLF is set to be applied. The RLM result in the s-BWP may be set in advance or reflected in RLM / RLF event judgment for the serving cell according to the base station setting.

As described above, if the base station does not set the RLM / RLF in the s-BWP to the mobile station, it can support fallback to p-BWP instead. The UE can start a fallback timer that is set separately because it satisfies the condition for determining the reception error of the base station signal due to the deterioration of the channel quality in the s-BWP. If the condition that the base station signal is received again, the fallback timer can be stopped or reset. If the error condition of base station signal reception continues to be satisfied, the terminal switches the RF to the p-BWP when the fallback timer expires. After switching to p-BWP, the terminal monitors the effective control channel according to the p-BWP or commonly set control channel location and DRX setting. If the condition for successfully receiving the feedback or UL signal in the s-BWP is not satisfied until the predetermined time or timer expires, the base station also sets the control channel location and time location setting (DRX setting or DRX setting, And to transmit the control signal to the terminal in a valid control channel in accordance with a different time location setting.

According to another embodiment, if the base station does not set the RLM / RLF in the s-BWP to the terminal, it may instead support fallback to p-BWP. When the terminal receives the Activation Command for s-BWP, it can start or restart the separately set Fallback timer. If the error condition of base station signal reception continues to be satisfied, that is, the Activation Command for s-BWP is not received and the fallback timer expires, the terminal switches the RF to the p-BWP. After switching to p-BWP, the terminal monitors the effective control channel according to the p-BWP or commonly set control channel location and DRX setting. If the condition for successfully receiving the feedback or UL signal in the s-BWP is not satisfied until the predetermined time or timer expires, the base station also sets the control channel location and time location setting (DRX setting or DRX setting, And to transmit the control signal to the terminal in a valid control channel in accordance with a different time location setting.

The detailed options of the Fallback option of the DL band part are as follows.

- Opt1: Set to monitor the PDCCH or RS of the Fallback DL band part at the preset time

- Opt2: Set the terminal to monitor PDCCH or RS of Fallback DL band according to specific conditions

   ● Condition: No HARQ ACK / NACK, HARQ NACK count, DCI format, QoS level, or timer expires

- Opt3: Fallback to the fallback DL band part by command (DCI, MAC CE) through other cell (CA case) of the terminal.

The procedure for activation and deactivation of BWP may be as follows.

If the MAC entity is configured with one or more sBWPs, the network may activate and deactivate the configured sBWPs.

The network activates and deactivates the sBWP (s) by:

- sending the Activation / Deactivation MAC CE;

- configuring s BWPDeactivationTimer timer per configured sBWP (except the sBWP configured with PUCCH, if any): the associated sBWP is deactivated upon its expiry.

The MAC entity shall for each NR-UNIT and for each configured sBWP:

1> if an Activation / Deactivation MAC CE is received in this NR-UNIT activating the SBWP:

2> activate the sBWP:

2> start or restart the BWPDeactivationTimer associated with the sBWP.

1> else if an Activation / Deactivation MAC CE is received in this NR-UNIT deactivating the SBWP; or

1> if thes associated with the activated sBWP expires in this NR-UNIT:

2> deactivate the sBWP;

2> stop the s BWPDeactivationTimer associated with the sBWP;

2> flush all HARQ buffers associated with the sBWP.

1> if NR-PDCCH on the activated sBWP indicates an uplink grant or downlink assignment; or

1> if NR-PDCCH on the Serving Cell scheduling the activated sBWP indicates an uplink grant or a downlink assignment for the activated sBWP:

- restart the s BWPDeactivationTimer associated with the sBWP;

<Example of BWP timer operation in Scheduling BWP of SCell>

The following example illustrates a method in which the UE applies different conditions for restarting the BWP timer for DCI reception (decode) according to a scheduling instruction according to self-carrier scheduling or cross-carrier scheduling. The setting of the self- / cross-carrier scheduling can be set by the base station as the RRC signal to the UE or by the carrier indicator field of the DCI.

In the case of self-carrier scheduling, the UE: 1) receives the DCI from the serving cell at the current active BWP; Or 2) successful reception of any DCI from the cell in which the active BWP is operating; Restart the BWP timer.

In the case of cross-carrier scheduling, a scheduling cell for transmitting and receiving a scheduling DCI and a scheduled cell for transmitting and receiving a PDSCH or PUSCH indicated by a DCI may be considered. When the timer and default BWP are set in the scheduling cell; 1) If the timer and default BWP are not set in the scheduled cell, if the scheduling DCI is successfully received from the scheduling cell, the BWP timer of the scheduling cell is restarted. As another example of a situation where a timer and a default BWP are set in the scheduling cell; 2) If the timer and the default BWP are set in the scheduled cell, a) if the scheduling DCI for the scheduled cell is successfully received; Or b) if the scheduling DCI from the scheduling cell is successfully received, or the scheduling DCI for the scheduled cell is successfully received; Or c) successful receiving both the scheduling DCI from the scheduling cell and the scheduling DCI for the scheduled cell; i) restart the BWP timer of the scheduled cell; Or ii) restart the BWP timer of the scheduling cell; Or iii) restarting each BWP timer of the scheduled cell and the scheduling cell together; Lt; / RTI &gt;

According to one embodiment of the scheduling operation, the network can set a condition for a BWP timer set in a scheduled cell to one of the following. a-1) receive a DCI from a scheduled cell; a-2) receive a DCI indicating a BWP of a scheduled cell in a scheduled cell; a-3) receive a DCI indicating a BWP instead of a default BWP of a scheduled cell in a scheduled cell; a-4) receive the DCI from the active BWP of the scheduled cell; a-5) receive the DCI indicating the current active BWP of the scheduled cell in the scheduled cell; b-1) receive the DCI from the scheduling cell; b-2) receive a DCI indicating scheduling cell no BWP of the scheduled cell; b-3) Receive the DCI indicating the BWP instead of the default BWP of the scheduled cell in the scheduling cell; b-4) receive the DCI indicating the currently active BWP of the scheduled cell in the scheduling cell;

According to an embodiment of the scheduling operation, the network may set a condition for a BWP timer set in a scheduling cell to one of the following. c-1) receive the DCI from the scheduling cell; c-2) receive a DCI indicating a BWP of a scheduled cell in the scheduling cell; c-3) Receive the DCI indicating the BWP instead of the default BWP of the scheduled cell in the scheduling cell; c-4) receive a DCI indicating the current active BWP of the scheduled cell in the scheduling cell;

The various conditions can be settable or fixed in the standard. According to one embodiment of the BWP timer based BWP switching based on the BWP timer in the CA structure, when the UE receives a scheduling DCI for SCell in the PCell, the DL assignment or the UL grant indicated by the scheduling DCI received by the UE in the PCell, Indicate one BWP. However, the BWP monitored by the terminal in the PCell is usually sufficient for the narrowband default BWP. Therefore, even if BWP timer is set in PCell, BWP timer for PCell's active BWP is not restarted for scheduling DCI reception for SCell's BWP. On the other hand, if the BWP timer is set in the SCell, the BWP timer for the BWP instructed by the SCell for the reception of the scheduling DCI for the BWP of the SCell received from the PCell must be restarted to maintain the current active BWP. Otherwise, the UE switches to SCell's default BWP according to the expiration of the BWP timer, and then experiences frequent BWP switching and RF retuning loss according to the scheduling instruction for the BWP rather than the default BWP.

On the other hand, self-carrier scheduling should be able to operate in PCell or SCell, that is, any serving cell. To support both self-carrier scheduling and cross-carrier scheduling in one serving cell, the BWP timer is re-started on condition that the UE receives the scheduling DCI for the current active BWP of one serving cell from the PCell or SCell . On the other hand, another condition of starting the BWP timer (re) is that the UE receives the scheduling DCI for another BWP in the active BWP. In the case of self-carrier scheduling, this condition is established as it is, but a cross-carrier scheduling constraint is required. For example, if PCell's BWP1 instructs scheduling of SCell's BWP2, the BWP timer for PCell's BWP1 should not (re) start, but only (re) start the BWP timer for SCW's BWP2. Therefore, when a terminal that previously operated BWP3 as active BWP in SCell receives a scheduling instruction for BWP2 from PCell, it must start a BWP timer for BWP2. That is, the UE starts the BWP timer for the BWP to be switched on condition that it receives the scheduling DCI indicating the BWP switching in one serving cell.

The procedure consisting of the conditional statements in the following [Table 8] shows an embodiment of the above contents.

[Table 8]

When cross-carrier scheduling occurs in the CA, the RF retuning at the SCell can be reduced as follows. Scheme 1 is as mentioned in the above embodiment. Solution 2 is a simple way to support the configuration.

Solution 1: Receive the scheduling DCI for SCell's active BWP or the scheduling DCI that instructs SCell's BWP switching, and restart the BWP timer of active BWP indicated by scheduling.

Solution 2: If cross-carrier scheduling is enabled, ignore SCell's Default BWP setting and / or BWP timer setting. Therefore, the BWP timer restart operation itself does not occur, or the BWP timer operation is stopped. The suspended BWP timer operation resumes when self-carrier scheduling operation occurs in the SCell.

If cross-carrier scheduling occurs in the CA, the power dissipation for the SCell can be reduced as follows. That is, if the BWP inactivity timer expires for SCell, SCell BWP deactivation and PCell can be maintained. The detailed operation according to Timer expiration is as follows;

Solution 1: Set default BWP to zero BWP with no real frequency domain.

Solution 2: Set default BWP to PCell's BWP.

Solution 3: SCell deactivates the currently active BWP with activation.

Solution 4: Deactivation of SCell BWP if default BWP is not set in SCell and cross-carrier scheduling is set.

+ Associated action with BWP switch / activation indication in single or multiple active BWP operation

The terminal may view only one or more of one or more of the set BWPs at the same time according to RF conditions. Therefore, it is advantageous in terms of scalability that the BWP indication of the base station is commonly applied to terminals having different RF conditions. However, the base station must know other RF conditions of the UE through the capability report of the UE in advance. Otherwise, when a terminal issues an activation instruction for BWP # 2 in BWP # 1, it is impossible to know whether BWP # 1 has been deactivated due to the RF restriction of the terminal, and there is a possibility of malfunction. When a terminal operating as a single active BWP receives a BWP activation indication of a base station, it switches to the indicated BWP and deactivates the previous BWP. When a terminal operating in Multiple Active BWPs receives a BWP activation indication of a base station, it activates the indicated BWP and maintains the BWP in use by activating the indicated BWP. Although the estimation approach based on the Capability Report of the terminal is simple, there is still a possibility of malfunction. For a clear procedure and operation, the base station should be able to set the maximum number of active BWPs of the terminal and also to clearly indicate the deactivation of the BWP. The terminal can be set in advance by which of the following two methods Active BWP will be operated or it can be set by the base station / network. In addition, this operation can be applied to a case where a BWP switch activation is performed in conjunction with a cross-BWP scheduling indication in addition to a separate BWP activation indication of the base station.

a) Multiple Active BWP is configured, but each Active BWP can only be switched to another Deactivated BWP. Therefore, changing the number of Active BWPs is only possible with RRC.

b) Set Multiple Active BWP and instruct Activated / Deactivated for each BWP. Since the number of active BWPs can be changed, the network should operate well so that it does not exceed the maximum number of active BWPs of the terminal or all BWPs are deactivated. If the base station instructs the mobile terminal to exceed the maximum active BWP, the terminal deactivates the first activated BWP of the previous active BWP, 2) Deactivates the activated BWP at the latest, or 3) Deactivated BWP of the lowest BWP, or 4) Deactivated the lowest BWP according to the priority between BWPs defined by the base station, or 5) Deactivated the BWP that the terminal arbitrarily decided; Lt; / RTI &gt; The determination of the BWP to be deactivated may be set to exclude the P-BWP.

+ DCI or MAC CE activation procedure including retuning latency

The UE can change the RF retuning time according to the relationship between the Active BWP switching condition and the switching BWP. The base station can set the time required for switching to another BWP to RRC as compared with one BWP (for example, P-BWP) based on the capability report of the terminal. If the terminal can not comply with this setting, the terminal can reactively reject each band.

If the base station instructs DCI, 1) Based on the BWP ID included in the DCI, the UE considers the switching delay time from the DCI reception time (subframe / slot / minislot) already set in the RRC to the completion of switching 2) monitoring the switching delay time from the DCI reception time (subframe / slot / minislot) to the completion of the switching with the BWP ID in the DCI; k is specified and the UE can monitor from the fastest control channel that is valid after the time determined according to the value of k.

In the case where the base station instructs the MAC CE, 1) Based on the BWP ID included in the MAC CE, the UE calculates HARQ ACK success time (subframe / slot / mini Slot) to the completion of the transition, or 2) the BWP ID included in the MAC CE is used to monitor the transition delay time already set in the RRC , The MAC is interpreted and the BWP conversion is determined to be the fastest available in the activated BWP after the switching delay from the time when the MAC decides to switch the indication to PHY (subframe / slot / minislot) Or 3) the switching delay time k from MAC CE reception success point (subframe / slot / minislot) to completion of switching, together with BWP ID in MAC CE Or 4) monitoring the BWP from the highest effective control channel in the activated BWP after the transition delay time from the time of successful reception of the MAC CE (subframe / slot / minislot) to completion of switching, or 4) And the switching delay time k from the time point at which the HARQ ACK for the success of the MAC CE reception is transmitted (subframe / slot / minislot) to the completion of the switching is specified and the HARQ ACK success time point Monitoring from the fastest control channel available in the activated BWP after the transition delay time from the subframe / slot / minislot) to completion of switching; Lt; / RTI &gt;

The switching and activation / deactivation of the BWP will be discussed in detail.

The BWP activation / deactivation operation of the terminal may be restricted according to the maximum capacity of the RF BW of the terminal. Referring to FIG. 10A, when the terminal monitoring BWP1 activates BWP2 by the instruction of the base station, it can not inevitably monitor BWP1. Therefore, the base station must deactivate BWP1 and instruct the terminal to activate BWP2. This inevitably requires two commands for one operation. Referring to FIG. 10B, operation is instructed by one switching command without sending activation and deactivation separately. This switching method is more efficient, so you can base this direction on your design.

However, the terminal can expand the maximum capacity of RF BW and support various services according to BWP or connect to TRP (Transmit / Reception Point). In this case, switching may be possible. FIG. 11A illustrates a case where the BS always operates in the RF BW range of the UE by switching based on the RF information of the UE. However, as shown in FIG. 11B, the base station may instruct the active BWP, which the terminal is in operation, to no longer be able to monitor by the scheduler's decision. That is, the base station instructs to switch BWP2 to BWP3, and the terminal can not include BWP1 in the maximum RF BW. In this case, the terminal must inevitably Deactivate BWP1. When the operation of switching BWP3 back to BWP2 is triggered by a base station indication or a timer, the operation of the terminal for BWP1 should be defined. Assuming that the base station knows all the situations and can inevitably see Deactivated in BWP1, it can set the rule to activate BWP1 in conjunction with switching from BWP3 to BWP2. Alternatively, the Activation for BWP1 that has already been Deactivated can be set to prevent activation of BWP1 until the base station instructs and the UE has a base station instruction.

Let's take a look at operating with activation / deactivation instructions without using switching. 12A shows activation of BWP3. As a result, BWP2 remains active as it is, but BWP1 is deactivated because it is out of the RF BW of the terminal as in the previous case. In this case, when the BWP 3 is deactivated, the operation of the BWP 1 processing part should be considered. In FIG. 12A, the BWP 1 is deactivated. Such an operation leaves ambiguity in the implementation of the terminal. FIG. 12B deactivates BWP1 before activation of BWP3 to avoid ambiguity. Usually, deactivation of BWP3 will be timer based. Therefore, unless otherwise indicated, BWP1 will remain deactivated. Thus, FIG. 12C shows a case in which BWP1 is implicitly activated when deactivated according to the timer operation for BWP3. If these rules are well defined, it is an excellent method in terms of efficiency. 12D is an operation for explicitly restoring BWP1 to activated, but is not efficient.

On the other hand, the above methods may cause a large number of activation / deactivation or switching instructions depending on the number of BWPs, or inefficiency may occur. FIG. 13 shows a method of grouping BWPs concatenated on the frequency side in order to solve this problem efficiently in group units. According to this method, the BS groups the BWPs appropriately according to the size of the maximum RF BW of the UE and switches between the groups, thereby maximizing the efficiency and resource utilization. To support this, BWP group information should be set together when setting up BWP with RRC message, and the index for BWP group should be indicated including DCI or MAC CE.

[SCell deactivation behavior by BWP deactivation]

BWP switching of the terminal occurs by scheduling instruction by the base station. This effectively turns one of the BWPs in the activated BWP into the activated state. The BWPs other than the activated BWPs may be activated or deactivated according to the BW support capability according to the RF / BB implementation of the terminal. Since the scheduling instruction of the base station operates at the layer 1, it is difficult for the MAC process, for example, in the upper layer of the base station to immediately know the current state of the BWP of the UE. At some point, however, the MAC process needs to know the state of the BWP of the terminal in order to perform / direct the operation associated with the BWP. A timer for deactivation of BWP should be introduced to match the state of the BWP of the UE that the UE understands in the MAC process. The base station can set a timer for each UE, cell or BWP to the UE. Upon receiving a scheduling instruction for one BWP by the base station, the UE must determine the state of the active BWP that was previously used by the scheduling instruction. The base station can determine the BWP deactivation timer according to the BWP deactivation timer set for the UE without using a separate deactivation indicator for the active BWP that has been used previously. For example, if the BW capability of the UE is not high enough to deactivate the previous active BWP when switching to another BWP according to the scheduling instruction, the BWP deactivation timer value can be set to zero. As another example, in the case of a terminal capable of receiving a previous active BWP in an active state even if the terminal has a high BWP capability and switches to another BWP according to a scheduling instruction, the BWP deactivation timer value can be set to an appropriate value larger than 0. The BWP deactivation timer value can be set in units of PDCCH monitoring occasion or a symbol, slot, or subframe unit, such as a specific unit. For example, the BWP deactivation timer starts (re-starts) when DCI is received in the active BWP, and increases the timer value if DCI is not received for each specific unit. When the Timer value reaches the maximum value set by the RRC, the UE determines that the corresponding BWP is deactivated. As another example, when the BWP deactivation timer receives (re-starts) the DCI indicating the same active BWP in the active BWP, it increases the timer value if the DCI is not received for each specific unit. When the Timer value reaches the maximum value set by the RRC, the UE determines that the corresponding BWP is deactivated.

As another example, the BWP deactivation timer starts when receiving a scheduling DCI for another BWP in the currently active BWP, and if the scheduling DCI indicating the BWP indicating that the BWP deactivated timer is running is not received for each specific unit, . When the Timer value reaches the maximum value set by the RRC, the UE determines that the corresponding BWP is deactivated. In another example, the BWP deactivation timer starts when a scheduling DCI for another BWP is received in the currently active BWP, and if the scheduling DCI indicating the BWP indicating that the BWP deactivated timer is running is not received Increase the value. Or the scheduling DCI indicating BWP that the BWP deactivated timer is running terminates the BWP deactivated timer. When the Timer value reaches the maximum value set by the RRC, the UE determines that the corresponding BWP is deactivated.

In the operations and examples described above, the DCI for (re) start of the BWP deactivation timer is either a scheduling DCI, a scheduling DCI for a DL BWP, or a scheduling DCI for a UL BWP paired with a DL BWP.

On the other hand, the SCell deactivation timer can be set separately. The terminal re-starts the SCell deactivation timer when it receives a DCI from the SCell or receives a scheduling DCI for the Scell. The UE increments the SCell deactivation timer value when the condition is not satisfied. When the SCell deactivation timer reaches the set maximum, deactivate SCell. Since the BWP deactivated timer and the SCell deactivation timer work together, the last BWP of the SCell can be deactivated as shown below. In this case, since data scheduling is no longer possible in the SCell, the UE can operate according to one of the following methods according to the setting of the base station.

● If SCell's last remaining BWP is deactivated;

Option 1: Control according to the SCell deactivation timer regardless.

Option 2: SCell also deactivates.

Option 3: Control according to timer of BWP receiving scheduling DCI for SCell.

[Self- / cross-BWP scheduling]

The base station can control transmission / reception in the control channel or data channel of the UE through a set of control resources in the p-BWP set for each UE. The base station can indicate DL (downlink) or UL (uplink) data transmission / reception regions by self-BWP scheduling or cross-BWP scheduling. The base station can support SCell BWP scheduling as well as PCell by combining CIF (Carrier Indicator Field) for cross-carrier scheduling of existing CA and BIF (BWP Indicator Field) for cross-BWP scheduling. In this case, the BWP index can be set as a unified index regardless of the DL and UL BWP, or the DL BWP Index and the UL BWP Index can be separately operated. DL and UL should be informed in the form of DC Control Information (DLI) to distinguish between DL and UL. That is, the terminal can distinguish the correctly indicated BWP by the combination of the DCI format and the BWP index.

In general, in case of uplink scheduling, it is possible to instruct a terminal through a control resource set with a predetermined delay value (e.g., 4 ms) or a separate delay value. In the system considered in the present invention, in the case of cross-BWP scheduling, which may require bandwidth modification even in downlink scheduling, a PDSCH for data transmission / reception in the same subframe as a downlink control channel (PDCCH) While it is necessary to separately indicate the specific subframe (or slot, symbol) that comes next in time. This is because the processing time required for RF (Radio Frequency) and Retuning of the BB (Baseband) circuit is required as the position of the band to be used suddenly changes. Therefore, the base station transmits the available band information included in the capability report of the UE, It should be instructed to transmit and receive the downlink resource after the delay time set after the control signal of the base station in consideration of the degree of change of the band used by the terminal. 14A schematically shows an operation of performing self-BWP scheduling and cross-BWP scheduling for downlink data transmission and reception, and a self-BWP scheduling and cross-BWP scheduling of uplink data transmission and reception. The delay time is included in each control signal, or at least one delay time value may be preset for each S-BWP during capability negotiation and connection establishment / reconfiguration of the UE. Since the delay in the case of completely changing the band used by the terminal is larger than in the case where the bandwidth of the terminal is partially overlapped but only the bandwidth is changed, the base station may send the delay time as a control signal, An index of more than one delay value may be sent as a control signal so that the UE may perform a downlink reception operation after an appropriate delay. If the delay value is set to 0 or is not set, the terminal operates as receiving downlink data in the same TTI (Transmission Time Unit). The UE may abandon the downlink data reception of the base station when it is predicted that the band switching according to the delay time value will fail or fails. According to the BS setting, the UE can report the discarding of the transmission block (Transport Block) or the feedback information of the HARQ process ID. Referring to FIG. 4A, a location of a control resource group in another band or another band can be indicated through a control resource group in one band. The UE switches the RF to receive a control resource set of another band (band 2) in one band (band 1) according to the instruction of the network, and then receives the downlink or uplink data from the control resource set of band 2 And receives transmission information.

14B shows three types of band scheduling schemes in more detail in the case of downlink. The terminal sets up the first band (BWP # 1) and the second band (BWP # 2) through an RRC connection establishment or reconfiguration procedure. Here, it is assumed that the size of the first band is smaller than the size of the second band, and the size of the second band is equal to the maximum operating band of the terminal. The terminal also monitors the control signal in the first small band to reduce power consumption. First, the following operation, referred to as self-BWP scheduling, is described. The UE receives the DL control signal from the Node B in the nth slot through the first band and receives the data transmitted by the Node B in the same first band as the control signal according to the downlink control signal . The time resource position (start and interval) of the data channel can be set statically for each UE or dynamically by using the index in the slot or symbol unit as the downlink control signal. A method of notifying the self-BWP scheduling is to inform the band index of the downlink control signal or to inform the base station of the type of the specific control signal (for example, when the resource start position information considering delay time or delay time is not included in the control signal) You can tell. Next, the following operation referred to as cross-BWP scheduling will be described. The terminal receives the downlink control signal from the base station in the (n + 1) th slot through the first band and receives the data transmitted by the base station in the (n + 2) th slot of the second band according to the downlink control signal. The time resource position (start and interval) of the data channel can be set statically for each UE or dynamically by using the index in the slot or symbol unit as the downlink control signal. The length of the slot or symbol must be recalculated based on the numerology information set in the specified band. If the UE is instructed to receive data after receiving the control signal at a shorter interval than the RF retuning delay previously reported by the base station, the UE transmits an RRC connection reconfiguration request to the base station Cause information to the base station or 2) Request p-BWP or Active BWP switch / setup to the base station through RRC message or MAC CE. Next, the following operation for implementing operations such as cross-BWP scheduling with BWP indication and Self-BWP scheduling will be described. The terminal receives the downlink control signal from the base station in the (n + 3) th slot through the first band and operates to receive the downlink control signal of the second band according to the indication of the downlink control signal. In more detail, based on at least one of a band index included in a downlink control signal and a downlink control channel resource location, the terminal monitors a downlink control channel of a second band by switching bands. If the downlink control channel resource location is not separately indicated, the UE monitors the downlink control channel at the earliest point after the completion of the RF retuning according to the downlink control channel for each band and its resource information set in the RRC. In order to know when the BS monitors the downlink control channel, the BS determines the timing of transmitting the control signal to the UE based on the RF retuning delay value determined according to the information related to the RF retuning delay reported in the UE capability, The position of the downlink control signal to be monitored can be determined.

 Meanwhile, the indication for the self-BWP scheduling operation and the cross-BWP scheduling operation or the BWP indication operation may be simultaneously transmitted to the UE on the downlink control channel. When the UE collides with the self-BWP scheduling and cross-BWP scheduling operations, for example, it can not perform RF retuning during data reception, the UE always prioritizes self-BWP scheduling, Priority data transmission / reception operation may be prioritized according to priority (numerology, control signal format, traffic, service, BWP, PDU size, delay requirement, etc.). When the self-BWP scheduling and the BWP indication operation are concurrently instructed, the UE monitors the earliest time downlink control channel after the RF retuning delay time after data transmission / reception according to the self-BWP scheduling indication is completed.

According to one embodiment, the base station is not allowed to indicate a scheduling operation that is not feasible within the re-tuning delay of the terminal.

Meanwhile, the base station can perform asymmetric p-BWP setting with different bands (position, size) in downlink and uplink for one terminal. However, the p-BWP supports both the downlink and the uplink so that the main control functions smoothly. Therefore, even if different bands are allocated, the terminal can be regarded as one p-BWP.

As described above, Cross-BWP scheduling is performed by 1) DCI / MAC CE signaling for cross-BWP scheduling, 2) DCI / MAC for BWP switch / activation indication (DCI / MAC CE) &Lt; / RTI &gt; In general, p-BWP is not changed by cross-BWP scheduling, but it may be useful to migrate p-BWP functionality if the function in p-BWP is to be maintained between BWP conversions. 1), the BS shall determine whether to switch the p-BWP to the RRC in advance or whether it should be included in the DCI / MAC CE. 2), the BS shall determine whether to switch the p-BWP in conjunction with the BWP switch / activation indication to the RRC or to include it in the DCI / MAC CE.

[Example of BWP timer and DRX inactivity timer working together]

Meanwhile, for the case where the DCI is lost in the BWP switching operation of the terminal according to the scheduling DCI, or when the base station does not send the scheduling DCI for the specific BWP, the base station sets a fallback or a default BWP to the terminal, Operation, it is possible to instruct the terminal to fall back, that is, to switch to the default BWP. For this operation, a timer set by cell, terminal, or BWP is called a BWP timer or a BWP inactivity timer. The terminal performs the following operations according to a predetermined or predetermined determination condition by the base station.

- If the terminal meets condition A, it starts the associated BWP timer.

- If the terminal satisfies the condition B for one control channel observation period, it increases the BWP timer.

- If the terminal meets condition C, it restarts the associated BWP timer.

- When the BWP timer expires, that is, when the timer reaches the maximum value, the terminal expires the BWP timer and switches to the default BWP set.

Condition A can be at least one of the following:

A-1) receives a scheduling DCI for one active DL or UL BWP from the base station;

A-2) receive scheduling DCI from one active DL BWP from the base station;

A-3) receives a scheduling DCI for one active DL or UL BWP rather than the default BWP from the base station;

A-4) receive scheduling DCI from one active DL BWP, not the default BWP, from the base station;

A-5) Receive the scheduling DCI for the current active DL or UL BWP from the base station;

A-6) receive scheduling DCI from the current active DL BWP from the base station;

A-7) Receive the scheduling DCI for the current active DL or UL BWP rather than the Default BWP from the base station;

A-8) Receive the scheduling DCI from the active DL BWP rather than the Default BWP from the base station;

Condition B can be at least one of the following:

B-1) currently does not receive any scheduling DCI from active DL BWP;

B-2) Current active DL BWP does not receive scheduling DCI for current active DL BWP;

B-3) does not receive any scheduling DCI for BWP other than default BWP;

B-4) does not receive the scheduling DCI for the current active DL BWP in the current active DL BWP rather than the default BWP;

Condition C can be at least one of the following:

C-1) receives a scheduling DCI for the current active DL or UL BWP from the base station;

C-2) receives the scheduling DCI from the current active DL BWP from the base station;

C-3) receives the scheduling DCI for the current active DL or UL BWP rather than the Default BWP from the base station;

C-4) receives the scheduling DCI from the current active DL BWP rather than the default BWP from the base station;

According to one embodiment, one DRX inactivity timer for a DRX operation is set for each UE, while a BWP timer is set according to a setting method of each cell, terminal, or BWP. First, the case of setting the BWP timer value for each serving cell will be exemplified.

As described above, the BWP timer starts when the condition for receiving the scheduling DCI for a certain BWP is satisfied. On the other hand, the DRX inactivity timer starts (restarts) when the UE satisfies the condition of receiving any DCI. Since the BWP timer and the DRX inactivity timer are different and the conditions for restarting each timer are also different, the BWP timer expires before the DRX inactivity timer, or conversely, the DRX inactivity timer may expire before the BWP timer.

1. If the BWP timer expires before the DRX inactivity timer:

The UE switches from the active BWP to the default BWP according to the expiration of the BWP timer and maintains the DRX inactivity timer; b) restart the DRX inactivity timer; Lt; / RTI &gt;

2. If the DRX inactivity timer expires before the BWP timer:

Although the BWP timer can be maintained without any consideration, in this case, the UE may operate in the wide BWP even though the DRX inactivity timer of the UE expires and has already entered the DRX cycle. To avoid this situation, you can follow one of the following actions: a) Do not start the DRX inactivity timer until the BWP timer expires. b) When the DRX inactivity timer expires, the BWP timer expires. c) When the DRX inactivity timer expires, the BWP timer is maintained but not increased. d) When the DRX inactivity timer expires, the BWP timer is maintained. If the increase condition is satisfied, the timer value is increased. e) If the DRX inactivity timer expires, the BWP timer is maintained and the timer value is increased if the increase condition is satisfied in the On interval of the DRX cycle.

In order to expire the BWP timer due to the expiration of the DRX inactivity timer when the BWP timer operates at the layer 1 and the DRX inactivity timer operates at the layer 2, the expiration of the BWP timer from Layer 2 to Layer 1 Or stop) to the user. Alternatively, when the DRX inactivity timer expires, it can instruct Layer1 to switch to the default BWP set to RRC, and at the same time to expire (or stop) the BWP timer. The DRX inactivity timer of the UE is one, but since there may be a plurality of BWP timers, all the BWP timers set in the UE must be controlled (expired or stopped) according to the DRX inactivity timer expiration.

[Common signaling]

The base station sets to the mobile station that it will perform SRB (Signaling Radio Bearer) transmission in the p-BWP and operates. And can transmit and receive an RRC (Radio Resource Control) message or a NAS (Non-access Stratum) message through the SRB. For example, the Paging message is delivered from the MME to the terminal via the NAS message. The base station sets to the mobile station that it will transmit a DRB (Signaling Radio Bearer) to the resource in the p / s-BWP and operates. The PCS or p-BWP may be operated so that the UE is the same as the control resource or the band (that is, Access band) that operates in common during the initial access process. For example, in the case of a paging message, the operation scenario may be different depending on the state of the terminal. In an idle mode UE, paging can be received from a synchronization signal and a predetermined resource obtained from a PBCH (PHY Broadcast Channel), or received from a paging resource received from SI (System Information). Inactive mode In case of UE (state in which the base station (RAN) maintains the UE context for power saving in the connected state and omits some connected operation), the paging resource set in the RRC message in the connected state and paging Perform the procedure. Meanwhile, the paging resource set in the connected state may be different from the Access band.

On the other hand, in the case of a connected mode UE, an operation of receiving SI in a downlink shared channel or receiving a paging message in a p-BWP should be considered. Connected mode When a UE receives paging, it may be a paging message corresponding to another service / slice. Since the UE can see only a part of the bands corresponding to the set bands of the system-wide bands, the BS has to send the Common Signal from the upper layer, for example, SI messages to different terminals have.

Meanwhile, in order to allow all terminals to receive a common signal as in the existing LTE, a common BWP may be set, and a base station may preset an RRC message to set when the terminal should receive the common band . The base station sets a) to allow the terminal to receive the common band at a specific time, or b) to determine whether the common band is received according to the situation of the band in which the terminal is operating, And to receive the common band only when there is no operation indicated by the band in which the terminal is operating; The terminal can be set to operate according to at least one of the following. In one embodiment, at least two of the methods a), b) and c) may be separately set.

According to an embodiment, the BS can dynamically inform the UE of the reception of the common band through the band set in each terminal, unlike the method of determining whether to receive the common band according to the RRC message and the specific condition. However, in order to simplify the L1 signal, the position / size of the common band and its control resource set can be preset in the RRC message. To return the terminal to the dedicated band again, the base station must either: a) send a return indication on the common band; b) return after a preset timer expires; or c) Or d) set and move the designated BWP to the p-BWP by receiving the p-BWP change control signal in the common band; Lt; / RTI &gt;

According to a detailed embodiment,

A) Set the terminal to receive a common band at a specific time

   - SI, paging, RA msg2, 4 point instructions

      ● Gap or dynamic

B) Set occasion or gap and decide whether to receive or not according to current active band situation

   - Situation: Receiving common information as RRC message before point in time

C) When there is no instruction in the current active band of the terminal, common band reception

   - Separate indication: There is no scheduling or measurement operation already started in the active band.

On the other hand, the following four options can be considered to determine the signal quality in a particular BWP.

Option 1: P-BWP

Option 2: P-BWP and common BWP for initial access

Option 3: P-BWP and S-BWP (s)

Option 4: P-BWP, S-BWP (s) and common BWP for initial access

The BWP recovery operation is basically a procedure for converting the p-BWP to another BWP according to the channel quality measurement for the plurality of BWPs and the result. The BWP-based channel quality measurement operation and the BWP conversion procedure can be separated in a procedural manner, and the BWP conversion procedure can operate in one of the following ways.

a) The base station may set a plurality of BWPs in the RRC message together with the index, and then instruct BWP activation or deactivation by including the BWP index in the MAC CE or L1 signal. The terminal switches the BWP indicated by the BWP index to the activated or deactivated state according to the BWP activation or deactivation instruction.

b) The base station may set a plurality of BWPs with the index to the terminal in the RRC message and then indicate the BWP transition including the current BWP and the two BWP indexes for the target BWP with the MAC CE or L1 signal. The terminal changes the BWP indicated by the current BWP index to the deactivated state according to the BWP transition instruction, and switches the BWP indicated by the target BWP index to the activated state.

c) The base station can set two BWPs together with its index to the terminal in the RRC message, including an index for the setting, and then indicate the BWP transition with the setting index to the MAC CE or L1 signal. In response to the BWP transition instruction, the UE changes the currently activated BWP among the two BWPs specified in the setting to the deactivated state, and switches the currently deactivated BWP to the activated state.

d) The base station may set the m BWPs with the index in the RRC message to the terminal, and then indicate the BWP transition including the current BWP index by the MAC CE or the L1 signal. The terminal switches the BWP indicated by the current BWP index to the deactivated state according to the BWP transition instruction, and switches the BWP indicated by the next BWP index to the activated state in index order.

e) The base station sets m BWPs with its index to the mobile station in an RRC message, and includes an index for the setting, and then instructs a BWP transition including a setting index and a current BWP index as a MAC CE or L1 signal . The terminal switches the BWP indicated by the current BWP index to the deactivated state according to the BWP transition instruction, and switches the BWP indicated by the next BWP index to the activated state in index order.

f) The base station can set the m BWPs with the index and also set the priority of the BWP to the terminal in the RRC message and indicate the BWP transition including the current BWP index with the MAC CE or the L1 signal. The terminal changes the BWP indicated by the current BWP index to the deactivated state according to the BWP transition instruction, and switches the BWP indicated by the next BWP index to the activated state in order of priority.

g) The base station sets m BWPs with its index to the terminal in the RRC message, sets the priority of the BWP, including the index for the setting, and sets the setting index and the current BWP index To indicate the BWP transition. The terminal changes the BWP indicated by the current BWP index to the deactivated state according to the BWP transition instruction, and switches the BWP indicated by the next BWP index to the activated state in order of priority.

In the BWP switching procedure of the above a) -g), the retention time of the converted BWP is 1) until the next switching instruction comes, 2) until after the predetermined k [symbol, slot, subframe, frame] Until after the predetermined k [symbol, slot, subframe, frame] set by this RRC message; And can be effective in accordance with one of the conditions. When the retention time expires, it returns to the BWP state before switching.

In the BWP switching procedure of a) -g), the deactivation may be operated by a timer without any other indication. That is, when a terminal monitors a downlink control channel of a specific band, if the terminal does not receive a signal from the base station until the timer expires, the terminal deactivates the band.

According to an embodiment of the present invention, a method of setting a separate band for a RRM measurement for a neighboring base station to a mobile station is considered. The terminal may set a measurement band according to at least one of the following methods.

Option A: The serving base station sets the measurement band to the connected terminal based on the information received from the neighboring base station. The serving base station notifies the terminal of the measurement object's ID (eg, cell ID, TRP (TxRxPoint) ID) together with the position / size information of the measurement band. The configuration of the band may be different between the serving base station and the neighboring base station, but the serving base station controls the terminal to enter the area where the signal of the neighboring base station can be received. The MS succeeds in receiving the synchronization signal and the PBCH of the neighbor BS or receives the RRC message of the serving BS to obtain the numerology information used by the neighbor BS and recalculates the accurate RS position of the neighbor BS based on the obtained numerology information. The terminal performs measurement at the detected RS position.

Option B: The terminal succeeds in receiving the synchronization signal and the PBCH of the neighboring base station, determines the RS position according to the BW capability of the terminal included in the SI, and performs measurement at the corresponding RS.

Option C: The terminal performs the initial access procedure to the neighboring base station, reports the capability information of the terminal, receives the response message of the base station, and performs measurement at the RS position included in the message.

In an embodiment of the present invention, a method of setting a base station to a mobile station in cooperation with a scheduling band for RRM measurement for a neighboring base station is considered. The base station can inform the RRM BW of the band-part index (BWPIndex) together with the resource setting for one or more CSI-RSs in the RRM measurement configuration. 1) The band index also has numerology information, so it follows the numerology information associated with the band that also indicates the numerology of the CSI-RS resource; or 2) The numerology information is included in the CSI-RS resource setting, If there is a conflict, follow the numerology information contained in the CSI-RS resource configuration for RRM measurements.

Meanwhile, the serving BS may separately set a control channel of the serving BS and a resource region for receiving the RS of the neighbor BS, or may integrate the resource region. The UE must perform the control channel reception operation and the neighbor base station measurement operation in a TDM or FDM manner. In case of TDM, the serving base station can allocate a measurement gap. The base station is configured to set a) the terminal to receive the neighboring base station signal at a specific time, b) determine whether the neighboring base station signal is received according to the operational status of the terminal's serving base station, Set to receive the neighboring base station signal only if there is no opportunity for the serving base station at that particular opportunity and at that time; Lt; / RTI &gt;

In performing L3 filtering, the terminal can separate the measurement results for each BW when the measurement result in the RRM BW is reflected in the input value of the L3 filter, or in both the RRM BW and the active band BW. Also, if the RRM BW is reset or the averaging value for RRM BW does not rise from L1 within the set time, the terminal abandons the existing L3 filtering and starts a new operation.

One or a plurality of BWs can be set to the UE according to the base station determination, and when a plurality of RRM BWs are set, the terminal selects an RRM BW having the shortest re-tuning delay according to the relationship with the active band Can operate. Or the RRM BW including the SS among the plurality of RRM BWs. Or based on the priority set by the base station and the re-tuning delay constraint for a plurality of RRM BWs. That is, the UE selects the RRM BW having the highest priority among the RRM BWs whose re-tuning delay for switching from the Activated or the primary band to the RRM BW is smaller than the k time [symbol, slot, subframe, frame].

[Switching operation between Common BWP and Dedicated BWP]

A common BWP (or Initial active BWP) set as an MIB or SIB for initial connection is a synchronization signal and a BWP commonly used by terminals that have successfully connected to the MIB / SIB. On the other hand, the Dedicated BWP is set as the RRC message, and the base station generally sets the BWP to be used in the connected mode operation of the UE to the BWP configuration IE during the RRC connection establishment procedure. Since only the Dedicated BWP is assigned the BWP ID, in order to set the DCI or CSI-RS, the BWP ID of the specific BWP must be indicated together.

The network or the base station can instruct to operate in at least one active BWP among the RRC connection establishment procedure and the dedicated BWP after setting the terminal after completion. The method can be divided into two. Method 1 is a method in which a base station instructs a terminal operating in Common BWP to switch to a dedicated BWP using DCI or MAC CE. Method 2 is a method of determining a rule to switch to one active BWP (or first active BWP) indicated according to the BWP setting immediately after the RRC connection establishment procedure of the base station and the terminal is completed.

According to a general embodiment, when there is no BWP setting, the UE proceeds to the RRC connection establishment procedure in the Common BWP, and when it is completed, continues to perform the Connected mode operation in the Common BWP. In this case, the base station can instruct the UE to perform the scheduling using the DCI format not including the BWP ID. In addition, the base station can indicate using the RS for the Common BWP and a predetermined BWP ID, e.g., 0, when setting the channel. If the BWP ID field in the CSI-RS configuration field is set to 0 and there is no Dedicated BWP setting, the UE understands that the CSI-RS setting is for the Common BWP, and when it operates in the Common BWP, do.

According to a general embodiment, a terminal receives one Dedicated BWP by setting a BWP according to an RRC connection establishment procedure in a common BWP. Upon completion of the RRC connection establishment procedure, the UE switches from the Common BWP to the Dedicated BWP to continue the Connected mode operation. In this case, the format of the DCI sent from the base station in the common BWP does not include the BWP ID before the establishment of the connection establishment, but the DCI format transmitted from the base station in the Dedicated BWP after the connection establishment is completed includes the BWP ID.

According to an embodiment of method 1, the base station may instruct the DCI or the MAC CE to convert the terminal operating in the Common BWP to the Dedicated BWP corresponding to the BWP ID, including the BWP ID. Common BWP uses DCI or MAC CE format that does not include BWP ID for terminal identification.

According to an embodiment of the method 2, the UE sets a plurality of Dedicated BWPs and one first active BWP among the Dedicated BWPs according to the BWP configuration according to the RRC connection establishment procedure in the Common BWP. When the RRC connection establishment procedure is completed, the UE switches from the common BWP to the first active BWP to continue the Connected mode operation. In this case, the format of the DCI sent from the base station in the common BWP does not include the BWP ID before the establishment of the connection establishment, but the DCI format transmitted from the base station in the Dedicated BWP after the connection establishment is completed includes the BWP ID.

The above method and embodiments may be similarly applied to a procedure of adding a Secondary Cell Group (SCG) in a Handover (HO) procedure or a Dual Connectivity (DC) structure. That is, the UE can start the RA procedure by sending a PRACH preamble to the target cell in the case of HO and the PSCell in case of the SCG addition in response to the RRC connection reconfiguration procedure from the base station. Also, the RAR signal of the base station should be received with respect to the PRACH preamble. Also, transmission and reception of the subsequent RRC message (msg3, msg4, etc.) should be performed. For this RA procedure, the BS establishes one DL BWP and one UL BWP to operate on the MS. The operation of the terminal may be different depending on how to set the DL / UL BWP for adding the HO and the SCG. According to the setting method A, the one DL / UL BWP is set as a common BWP. The UE performs similar operations on the DL / UL BWP for the target cell or the PSCell, such as a condition to be performed in the Common BWP in the PCell or to operate in the Common BWP. According to the setting method B, the one DL / UL BWP is set as the Dedicated BWP, and the RA resource and the BWP that can be performed are set as the BWP. The UE performs similar operations on the DL / UL BWP for the target cell or the PSCell, such as a condition to be performed in the Common BWP in the PCell or to operate in the Common BWP. According to the setting method C, the one DL / UL BWP is set as the Dedicated BWP, but the RA resource and the BWP that can not be performed are set. The terminal can acquire the Common BWP from the target cell or PSCell from the MIB / SIB and then perform the operation associated with the Common BWP.

For Method A, when adding HO or SCG, if DL / UL BWP for the initial RA procedure indicated by PCell acts as Common DL / UL BWP, but acquires all Common DL / UL BWP settings from MIB / SIB, It is possible to override the previous value of the UL BWP with the value set from the MIB / SIB. This action may be restricted to after the connection to the target cell or PSCell has been established.

For Method B, when the HO or SCG is added, the Dedicated DL / UL BWP for the initial RA procedure indicated by the PCell serves as the Common DL / UL BWP, but if both the Common DL / UL BWP settings are obtained from the MIB / SIB, -based RA is newly performed in the Common DL / UL BWP, and the contention-based RA is not performed for the Dedicated DL / UL BWP. This action may be restricted to after the connection to the target cell or PSCell has been established.

[Measurement Gap setting and measurement operation at the same time as RRM BW setting and BW part for Connected mode]

The base station can set up a frequency resource for performing RRM measurement to the UE and calls it RRM BW. Also, the base station can set one or more bands to the terminal for scheduling and the like. If the RRM BW and the BW allocated to the band can be switched without RF retuning, the UE can perform RRM measurement during signal transmission / reception with the base station. However, in the case of a terminal capable of switching between RRM BW and band BW only after RF retuning, RRM measurement should be performed according to the measurement gap setting of the base station. The delay time due to the retuning is determined by various factors such as whether the central frequency of the operating RF band of the UE is changed or whether numerology should be changed for measurement. Meanwhile, since the terminal can receive one or more bands, whether or not the measurement gap is applied can be conditionally determined according to the relation between the current p-BWP or the active BWP of the terminal or the RRM BW for the active band for data transmission / reception . That is, if the RF retuning or RF retuning delay from the one or more bands in which the current terminal is operating among the plurality of bands is greater than a predetermined or set time delay to the RRM BW, the set measurement gap is activated. In one specific example, if an RF retuning occurs to switch to RRM BW for one or more bands that are active or in use prior to k [slot, symbol or subframe] than gap start point according to measurement gap setting, Prepare the RRM measurement in the measurement gap. In the measurement gap, the UE must perform RF retuning in advance and measure the set measurement resources in the RRM BW. In another detailed example, the UE generates RF retuning to switch to the RRM BW for one or more bands activated or in use at the gap start point according to the measurement gap setting, and calculates the sum of the delay time and the minimum measurement time , The RRM measurement in the measurement gap is executed. In the measurement gap, the UE must perform RF retuning in advance and measure the set measurement resources in the RRM BW. If RF retuning occurs and it is determined that the measurement gap exceeds the end time within the combined time of the delay and the minimum measurement time, RRM measurement in the measurement gap is not performed. If the measurement report is not reported within a set period, the base station may request the terminal to inquire about the cause. The terminal reports an index value of the cause according to the request of the base station. Alternatively, the UE sends a measurement gap reset request to the base station, and the BS can reset the measurement gap based on the cause of the gap reset request sent by the UE and the UE capability information.

Meanwhile, the following contents can be further considered according to the relationship of the monitoring band between the serving base station and the neighbor base station.

Case A: aligned across cells

Measurement gap for intra-carrier is not configured

Including the minimum BW for sync / PBCH / (paging)

Case B: non-aligned across cells (Measurement gap for intra-carrier is configured)

Option 1: maintaining the common BW in the partial BW across cells

Option 2: flexible configuration for the partial BW

Case C: Partially overlapped across cells

Measurement gap for specific target is configured

[Additional measurement setting]

● Cell> In the Resource Set structure

- Different numerology & BW can be indicated for each cell

● Existing LTE: resource structure within the same MO per carrier, ie carrier center frequency & BW

● Terminal operation

- For BW with the same condition as the current serving MO,

- Option 1: Implementation of different condition measurements

- Option 2: Measurement of other conditions is done in a separate measurement gap.

- Option 3: Measurements in other implementations only if they are not restricted by one BW-specific measurement restriction setting

- Option 4: Measurement of other condition is measured by measurement gap only if it is not restricted according to one BW-specific measurement restriction setting.

● In other words, the effective gap pattern changes depending on the measurement gap set for each measurement BW.

FIG. 15 shows the operation of a flexible BW system oriented in a 5G communication system. Flexible BW system is achieved through three BWs of Access BW, Idle mode BW and Connected mode BW and their conversion.

Access BW means the minimum BW used by the UE to perform initial access procedures such as cell selection, SI acquisition, and Random Access. Access BW is basically predetermined according to the carrier frequency. However, in a scenario in which another RAT (Radio Access Technology) is connected as an anchor, the UE can receive information for acquiring Access BW information or Access BW through the anchor BS. The Access BW is composed of the bands exemplified in the present invention and can be set in the terminal by the base station in the SI or RRC message. The location of the basic downlink control channel is set as one or more control resource sets. Also, the location of the basic downlink data channel is set to the same position as the set of control resources. And a basic DL-SCH (downlink shared channel) of the L2 layer is set as a basic DL data channel.

Idle mode BW means a BW set by the UE for performing additional SI acquisition, paging, and random access procedures. As suggested in the present invention, the idle mode BW may be the same as the Access BW, but may be set to be different from the Access BW in order to improve the full utilization of the broadband. The setting method is SI, but it can be set to RRC message in some cases. That is, in the connection state, it is possible to preset the idle mode BW or acquire information for determining the idle mode BW (eg, the number of bands of the base station, the band / control resource set configuration, and the number of common signaling resources).

Connected mode BW means the BW set in the terminal for the control / data channel configuration. The band information is set in the RRC message. In addition to the base downlink control / data channel and base DL-SCH determined by Access BW acquisition, additional downlink control / data channels and DL-SCH may be established. When the UE receives a paging indication or UL data, it receives the setting for the connected mode BW through the Random Access procedure. The terminal switches to Connected mode and operates according to the control / data channel set in Connected mode BW.

For the RRM measurement, the synchronization signal SS and the CSI-RS can be considered. The synchronization signal is transmitted and received in the access BW. When the CSI-RS is cell-specific according to the characteristics, the idle mode BW or the connected mode BW, and if it is UE-specific, it is transmitted and received within the connected mode BW. The base station manages such BW according to various terminal conditions. According to situation 1, the UE sets a synchronization signal in the Access BW as an RS for RRM measurement and performs measurement. In addition, if the terminal does not have a separate setting for the idle mode BW, the terminal operates assuming that the idle mode BW is the same as the access BW. That is, Idle mode operation such as cell re-selection is performed according to the measurement result of SS. According to Situation 2, the terminal receives an Access BW through the SI but sets up the idle mode BW with a larger bandwidth. At the same time, the cell-specific CSI-RS for the idle mode BW is set. The UE measures the cell-specific CSI-RS according to the measurement setup, and performs idle mode operation such as cell re-selection based on the result. Since the UE measures the SS for a base station that does not use the cell-specific CSR-RS, the UE operates by reflecting the offset value for correcting the error between the performance indicators. Depending on the measurement setup, the terminal may operate on the basis of the representative values for SS and cell-specific CSI-RS results. According to Situation 3, the terminal is configured with an idle mode BW that does not include Access BW via SI. At the same time, the cell-specific CSI-RS for the idle mode BW is set. The UE measures the cell-specific CSI-RS according to the measurement setup and performs idle mode operation such as Cell (re-) selection operation based on the result. Since the UE measures the SS for the base station that does not use the cell-specific CSI-RS, the UE operates by reflecting the offset value for correcting the error between the performance indexes. In this case, the neighbor BS transmits the SS in the Access BW, and the UE monitors the Idle mode BW different from the Access BW set by the serving BS. Therefore, the BS performs RF re-tuning to the UE to measure Access BW of the neighbor BS Gap or Measurement Resource must be set. The UE measures the SS of the neighboring base station in the set gap or resource and performs idle mode operation such as cell re-selection by reflecting offset correction value for error correction. According to situation 4, the UE receives an Access BW or an Idle mode BW through an RRC message, but the connected mode BW having the same or larger bandwidth is set. In addition, the cell / UE-specific CSI-RS for the connected mode BW is set. The UE measures the Cell / UE-specific CSI-RS according to the measurement setup, and performs Connected mode operation such as RRM measurement and reporting based on the result. The UE measures UE-specific CSI-RS with priority given to cell-specific CSI-RS and SS in order of priority. The terminal reports the measurement result separately for each kind of measured RS. According to situation 5, the UE receives an Access BW or an Idle mode BW through the RRC message or a partially overlapped Connected mode BW. In addition, the cell / UE-specific CSI-RS for the connected mode BW is set. The UE measures the Cell / UE-specific CSI-RS according to the measurement setup, and performs Connected mode operation such as RRM measurement and reporting based on the result. The terminal reports the measurement result separately for each kind of measured RS. Since the UE measures the SS for a base station that does not use the Cell / UE-specific CSI-RS, the UE operates by reflecting the offset value for correcting the performance index error. At this time, the neighbor BS transmits the SS in the Access BW, and the UE monitors the Connected mode BW different from the Access / Idle mode BW set by the serving BS. Therefore, the BS performs RF re-tuning to the UE, mode Measurement Gap or Measurement Resource must be set to monitor BW. The UE measures the SS of the neighboring base station in the set gap or resource and reflects the offset value for error correction to perform connected mode operation such as RRM measurement and reporting.

[BWP Settings]

● DL BWP and UL BWP specification

● Separate technology for PCell and SCell

   - PCell

      ● RadioResourceConfigDedicated

      ● Primary DL BWP and primary UL BWP settings

      ● Initial activation during setup

   - SCell

      ● radioResourceConfigDedicatedSCell

      ● Interlocked BWP activation operation during Scell activation

   - common

      ● Default BWP setting for power saving

      ● Fallback BWP setting for solving BWP mismatch

● RRC message specification

   - RRC connection establishment

   - RRC connection reconfiguration

[Fallback procedure]

● Fallback for DL BWP

   - Opt1: Set to monitor PDCCH or RS of Fallback DL BWP at a predetermined point.

   - Opt2: Set up the terminal to monitor PDCCH or RS of Fallback DL BWP according to specific conditions

      ● Condition: No HARQ ACK / NACK, HARQ NACK count, DCI format, QoS level, or timer expires

   - Opt3: fallback to Fallback DL BWP by Command (DCI, MAC CE).

[BWP-scheduling]

Integrated implementation of BWP configuration and BWP-wise scheduling

   - How to set BWP Index (DL, UL, DL + UL)

   - Primary BWP

● CA scheduling

   - Operation when receiving CIF and BWP Index with DCI

● Retuning latency control

   - With DCI: control by slot or symbol unit

   - With BWP settings

      ● Setting latency with secondary BWP against primary BWP

[Common signal reception procedure]

A) Set the terminal to receive a common band at a specific time

   - SI, paging, RA msg2, 4 point instructions

      ● Gap or dynamic

B) Set occasion or gap and decide whether to receive or not according to current active band situation

   - Situation: Receiving common information as RRC message before point in time

C) When there is no instruction in the current active band of the terminal, common band reception

   - Separate indication: There is no scheduling or measurement operation already started in the active band.

[RRC signaling]

● For PCell;

● RRC connection establishment procedure

   - To establish SRB1

   - At least a pair of DL and UL BWP is configured

● RRC connection reconfiguration procedure

   - To establish SRB2 and DRB

   - One or more DL or UL BWP can be configured

16 is a diagram illustrating a configuration of a terminal device according to an embodiment of the present disclosure.

The terminal apparatus may include a transceiver for transmitting and receiving signals to and from another terminal, and a controller for controlling all operations of the terminal apparatus. It will be understood that all operations for supporting synchronization described in the present disclosure are performed by the control unit. However, it is needless to say that the control unit and the transceiver unit are not necessarily implemented as a separate device, but may be implemented as a single unit in the form of a single chip.

1 to 16 illustrate a configuration of a terminal, an example of a control / data signal transmission method, an operation procedure example of a terminal, and a configuration diagram of a terminal device are not intended to limit the scope of the present disclosure Be careful. That is, it should not be construed that all the constituent parts, entities, or operation steps described in the above-mentioned FIG. 1 to FIG. 20 are essential elements for carrying out the disclosure, and even if only some of the constituent elements are included, Lt; / RTI &gt;

The operations of the base station and the terminal described above can be realized by providing a memory device storing the program code in an arbitrary component in the base station or the terminal device. That is, the control unit of the base station or terminal device can execute the above-described operations by reading and executing the program code stored in the memory device by the processor or the CPU (Central Processing Unit).

The various components, modules, etc. of the entity, base station or terminal device described herein may be implemented in hardware circuits, such as complementary metal oxide semiconductor based logic, firmware, And a hardware circuit, such as a combination of software and / or software embedded in hardware and firmware and / or machine-readable media. In one example, the various electrical structures and methods may be implemented using electrical circuits such as transistors, logic gates, and custom semiconductors.

While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. Therefore, the scope of the present disclosure should not be limited to the embodiments described, but should be determined by the scope of the appended claims, as well as the appended claims.

Claims (1)

A method for processing a control signal in a wireless communication system,
Receiving a first control signal transmitted from a base station;
Processing the received first control signal; And
And transmitting the second control signal generated based on the process to the base station.

Images